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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea3ea488c0aaf89dfba93a8f11a0599d1883d83730a8af6ede75689207bbe95' 
  AND token = 'IbyHXNLTFX+Zz91IznOpDnFu0o0wd8eTo+9q34+INE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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