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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2782938218d4266f28985e0005cc0b9bf390472d884a61391936ced2483e3e1' 
  AND token = 'qebinN5LbL8B8qhKUzpKmE7hd+1w4+A+iNwWYOB5a4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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