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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6be87056f395afe74ef120ec5a091df48621be4b7d28a21b65e5600c14a5086' 
  AND token = 'Ued9bv3seF3TQ6blts2wZfWXHqzMlsApZ81AEYhu4Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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