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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9665abe21c1272e0bedbcbf8b3bc10803b01cce24dd790c368d44692ab6c087b' 
  AND token = 'WAeA4tLyBegzR2/MWTFFleQii8/HWpLUuEN6pho7dWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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