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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fc7953c0a2a7e994f7b881d20d4607a75a8ec5d2c0479fb58b3a373c715bdc' 
  AND token = 'GxqKxIKdu70mBjl+uR8iJ0w0JQuvqrSDGidhcJH4lUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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