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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58282018a78d2b2109001d25fce0df79b8a1dc94675b10bcad90fd30b72932fc' 
  AND token = 'rYCi3hNwPmIbIL2xVNck0Yn/r0J2TRJre72mYtE84Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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