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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472c9f69c6c11768d9ee8b50f51be2916ce2608dfc7ce1a16debae09b195d550' 
  AND token = 'vDqSe/dCkEoylbexkEUH4mfAOTiOnCuvFd6C4T6qkMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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