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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61db1354048a2d8783e6252391e1dd47a95af6c236f556e1a6cc8607a10759b7' 
  AND token = 'lPMUsYPIVeyQSpi1P2/urz+dG1zqppjNQkanKkLxknI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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