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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602f0bdd4f81b0dd3acd4e2cbeb0799d6247650dbb2854721194c3dd21b0ba3b' 
  AND token = 'AoGN/J82p6CHMGyFlWys4DY4qkmM+RuOC/m2R0Z+cb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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