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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ba5d33dde204f65aa657883945e595dd52f7736cf46c5f79cdd3ef0cc059ef' 
  AND token = 'MZDpbDtBPOfl52pI9E4noZN+y/bEgr0ZA92J3cXTn2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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