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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c138e181c2e2d31b156de11d4c1c3dcc49dd78f5a93a53ec955e46f65e1a1cf' 
  AND token = 'I5DolkPrkiBuytk94QHHTrJR2Mp1L7cf/j48eA0VHws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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