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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ef972d7ad337d3b62661deaca616b4a63113f8f90b422113ed660b939e0b66' 
  AND token = 'nLoTo/2lJ+4MXX8+DoBKUjpZXAwvNE1tlVSLHnv2ry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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