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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9997f3f815e898715f5fd08946585e622a30c5d1413199f17d3068e8b8d6f288' 
  AND token = 'Mz/eayEgIlmCQlrc5+nAyBjEHyEoNI2ASfLi4SAdK8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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