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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d52e74ba19924e28d0f1bebf8d24ac1708fc701e4ec0d80e820bee934096723' 
  AND token = '0BnOBjpN5GbzMmJqv+Sv5CMXy35Wdw1SDredL4VEI0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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