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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9749dc236a4726e4284fb606de29d4ad326ced6e71e976f52cf8599f39ed97d2' 
  AND token = 'f5InLyL0RH5FXTak4TMlbBRbbDFKr4XHKGi2olNdRx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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