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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ae4ebd7950086bd3d443a13e4899261ab5a38e2e4aab552f1c0ccf19708f64' 
  AND token = 'S3q/J3W4eKpi7RVDqAgQx03S1Ec0rIzDyzyJws0V20g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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