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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086952f531fe790c687dc3d3f0eb1b4940ca3a3e1943a312b2b018ea0eb8bc32' 
  AND token = '87GoRIflFvYiR8lW2knJOR6lDhTYUojwDBPU8K5Rroo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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