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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1494746ef31938cf62002b9df430de736cf3129f3605db902670de4fa1c6c7e' 
  AND token = 'H12nMqvfjkxdINTPIzLk7ppdn3C/SpLBh7+rOH+aUH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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