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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808f2785ab17b4e86a9abf8ac8c70bab8945f3fb27c6a4670fd197208e9beeb6' 
  AND token = 'Ta2I0I2cQWFXgvCexvyXgZXT+dCTIk9bnB9DZHuozJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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