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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92804339db17953ecc393b0b261d71821160f9064f8e05df0e4792d2ae6d0b26' 
  AND token = '3Oktb68pbUpqnbwnSxQLHIDlVR4ggT85aEf8RbA6ru0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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