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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b22dc307f6ca91be3faf19da60b358edea4413f9a13949ac2905a5732da7410' 
  AND token = 'W0NvkvJgzQaC1AOVVUTAcvkRBwC8TFPAA9e07K7iqZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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