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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880ad0908f400ecb80f2ca51416cb5014d062a76438f6c1df7a7a8090ae223f4' 
  AND token = 'JlBMr/b/Dqss0Y2ZfjVz483kos2uZcAiHEcKjySuwgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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