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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31632598e97c85c10be88dccf73119e5fc7eed9574405072c87277c8494ec3d' 
  AND token = 'Lii3MAZ1Llq6KjtzckmUF0oOEM+K/MPEFmkRPzrTH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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