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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fe9e1518c070c84c612f8327e4aa8f8b68d3791106ee5c82fb98b506d3c4d8' 
  AND token = 'bLMZ+U1pmymFlvrGUErlO5etGCC5WDcHITL//jAFFQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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