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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7ecd86dc69a15c7c392f0ed84e0ca98dfb968cbb35e5d94965330e5322a938' 
  AND token = '0glS4GPnUUi2pNcMISc0efpMZ+3J/mXcIHanY/SOhT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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