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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96857854977fd0da8ee76c1c1a2d6402e91b0a3f95fea636e688778c1f9df4c5' 
  AND token = 'lXS1L3owUh0Q+dG3kYcQ0MLnpvo+5vu7L3sMDtCyL34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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