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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ea26997c3ab775dafde908b7dcc3806d250933bcd12ca9ec1cca897cf99335' 
  AND token = 'FWn25V/9HWCO9Imfkz98/aEmVDtxfUgHbFG5VFPb+ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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