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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0be7b3637a2e61b2edd773c7922c88594643ce0385e9fa7ca53fb87c834b45' 
  AND token = 'Tlm4RG9TvIUHKjeKdwQMuQm4jp3f2Z4khsqKPc8m6P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}