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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044f9b0f30b8cb450ca54d59f1b23364f8c62e6deda2afe9a6f2c5a14987946e' 
  AND token = '9G867QPYJPt7GYGi3HPU4Om3Cjfdaxy8vrvHRifSUtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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