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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2155abb3dae2b55a5de6acba34bf96291e613235c84975d97954f587e6d8c343' 
  AND token = 'ySNk7YAjreVuaqPv9j7MYQ1SLF1Or/D38KFqyEDab7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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