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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1eb9dbff30c4cbd112cf74e6e46ea5f3c145af1e804f0c059099f49dd4ea55' 
  AND token = 'gZxMC53FECAF2KHGwGPZ3GxPP5V1C9ROl6tfN5y43PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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