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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120475318dca013ddf3572afe822ce81b374692f98b2faaf5cec18a59333a24c' 
  AND token = '4EBssYNhT3SDYiPfTK1lCh8tszceFtsFyB8v+NXgOMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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