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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20c52e52de4e07a4bd93596da4526a6ae80905431c7c637c5714fac715baa83' 
  AND token = 'TnpI91zSHXd8SM5WDW2gKseWhzp4n0P2ZzcQx79oPG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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