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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba32728433427dc7c831ca6929a0a720a042e4cf4283e8bb75d7f34ca44f929' 
  AND token = 'HnQ/XNsZWUGNK20W1wzY2d4M6oz45wccdp8Trmf2RJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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