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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67066d938493195c0a8a8d86248d1315814c0019ec7a78a438942c5dcd91c819' 
  AND token = 'gicSX1K5ejb2k+fsduQE6HTUWQrDTtqJ/ZgQ/vir3nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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