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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6f71d9e73407be5bd323a90db90bb45d6944c22a02292fa9641f2072257d8b' 
  AND token = 'paqWUo3MGLUrvoK0m0ep3/NWQkfQ2v5cwzD93abSdAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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