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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606bc388ab881b08c9f5d6fd67e97b788497f8c83e5e85518a0f00706f5171d0' 
  AND token = '9SP19/5y1tiULMnYgAqZ6FmgO2j+uPK3DuQ1pCibFWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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