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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8ae54a619ce59b49df30284e4a1528f5ca95c30c6b6c952b13fdf882fe2cec' 
  AND token = 'M4EbNaSL9fYA7W5UWx340impc+2ZDW+s/TTmxi4unvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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