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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eca6d07a346174ac587c4cffb176c58a0599a771818ccce614b8b2391b89d3' 
  AND token = 'hMXmtpiGe8JhIgQguTl5KoLH/D9MERiWmrm1qB9bol4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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