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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0976a0f8c03fc3d7d3a116db471bae9382c64c5eb0642316b3671fc05fd2eabf' 
  AND token = 'MmiF/WIPSkJM4n1Q/BNVufEcMJs7S2nVj455fPFkkoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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