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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3fc983c67c9e0bd00107700b9914fc9e1bc1f670c60591305f7d952414b5a0' 
  AND token = 'S2Ix/45y+O8HqQ18XLlEjI54aYTho7BLRqEqciZfyMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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