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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbcf9474affa3d6316143188e3a35c7e19a05b6faf89e4dae93918934eca3c0' 
  AND token = 'vOzXUaTJ/KQjA2Jqt2uDe0ak3/8zMCBMhI48sHI5uxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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