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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5061861af488b0326546a9acc4c2ec6194524ca754a928f519af3e7f22a958f5' 
  AND token = '608xCej69wsXRJsFP0YHfs50kdxh5W9QPmuPKir2Zgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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