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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b500ca2e8b3219ad171bd7db5fa32d8f3c9133636bf908af78731c982312a2' 
  AND token = '8/es36IO/zuWT5+gi2IitFhnh70lUrjxHLRQNshvZjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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