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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7f255ae10494685104cf74835c9fc27ade4065a83e6fbf7a9219a18deb46f0' 
  AND token = 'JNC/IcKcvXk126SZffmzu2wn4ZFiOid7OAUBU+PhDOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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