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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cb2fe090fa6b206d3641db6daf3e786711b54283e8e2b69ed4def2bb533f90' 
  AND token = 'f6a8VJ3HW5eHTTWDa4jNK1gh6L4+KHUh2Jrq8+RIjJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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