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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32b4004e2df765ff910afc2d55daf7d9085f2194ba8113a5deaab71086bea35' 
  AND token = 'mEQyCl8kcO+8v79Oo0sKtS3Htrg/m4qjLKFFwSUUG0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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