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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c3eda60d0372a5222dd677736c01a74d24529a037a47464a29e777fffa1573' 
  AND token = '7ZlICj6tp3+V5iI7PWzOnrxiiHwdyQMP+MC4RCEHjsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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