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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4571b57386fc4e8ebaab5f1ce88115ea47df01ac5cda01d7fc6bfd031da30156' 
  AND token = '60PbMrx9mccN659STB2gfo7RigpdtTVFghOQRTywZS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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